1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // |
3 | // Regulator driver for TPS68470 PMIC |
4 | // |
5 | // Copyright (c) 2021 Red Hat Inc. |
6 | // Copyright (C) 2018 Intel Corporation |
7 | // |
8 | // Authors: |
9 | // Hans de Goede <hdegoede@redhat.com> |
10 | // Zaikuo Wang <zaikuo.wang@intel.com> |
11 | // Tianshu Qiu <tian.shu.qiu@intel.com> |
12 | // Jian Xu Zheng <jian.xu.zheng@intel.com> |
13 | // Yuning Pu <yuning.pu@intel.com> |
14 | // Rajmohan Mani <rajmohan.mani@intel.com> |
15 | |
16 | #include <linux/clk.h> |
17 | #include <linux/device.h> |
18 | #include <linux/err.h> |
19 | #include <linux/init.h> |
20 | #include <linux/kernel.h> |
21 | #include <linux/mfd/tps68470.h> |
22 | #include <linux/module.h> |
23 | #include <linux/platform_data/tps68470.h> |
24 | #include <linux/platform_device.h> |
25 | #include <linux/regulator/driver.h> |
26 | #include <linux/regulator/machine.h> |
27 | |
28 | struct tps68470_regulator_data { |
29 | struct clk *clk; |
30 | }; |
31 | |
32 | #define TPS68470_REGULATOR(_name, _id, _ops, _n, \ |
33 | _vr, _vm, _er, _em, _lr, _nlr) \ |
34 | [TPS68470_ ## _name] = { \ |
35 | .name = # _name, \ |
36 | .id = _id, \ |
37 | .ops = &_ops, \ |
38 | .n_voltages = _n, \ |
39 | .type = REGULATOR_VOLTAGE, \ |
40 | .owner = THIS_MODULE, \ |
41 | .vsel_reg = _vr, \ |
42 | .vsel_mask = _vm, \ |
43 | .enable_reg = _er, \ |
44 | .enable_mask = _em, \ |
45 | .linear_ranges = _lr, \ |
46 | .n_linear_ranges = _nlr, \ |
47 | } |
48 | |
49 | static const struct linear_range tps68470_ldo_ranges[] = { |
50 | REGULATOR_LINEAR_RANGE(875000, 0, 125, 17800), |
51 | }; |
52 | |
53 | static const struct linear_range tps68470_core_ranges[] = { |
54 | REGULATOR_LINEAR_RANGE(900000, 0, 42, 25000), |
55 | }; |
56 | |
57 | static int tps68470_regulator_enable(struct regulator_dev *rdev) |
58 | { |
59 | struct tps68470_regulator_data *data = rdev->reg_data; |
60 | int ret; |
61 | |
62 | /* The Core buck regulator needs the PMIC's PLL to be enabled */ |
63 | if (rdev->desc->id == TPS68470_CORE) { |
64 | ret = clk_prepare_enable(clk: data->clk); |
65 | if (ret) { |
66 | dev_err(&rdev->dev, "Error enabling TPS68470 clock\n" ); |
67 | return ret; |
68 | } |
69 | } |
70 | |
71 | return regulator_enable_regmap(rdev); |
72 | } |
73 | |
74 | static int tps68470_regulator_disable(struct regulator_dev *rdev) |
75 | { |
76 | struct tps68470_regulator_data *data = rdev->reg_data; |
77 | |
78 | if (rdev->desc->id == TPS68470_CORE) |
79 | clk_disable_unprepare(clk: data->clk); |
80 | |
81 | return regulator_disable_regmap(rdev); |
82 | } |
83 | |
84 | /* Operations permitted on DCDCx, LDO2, LDO3 and LDO4 */ |
85 | static const struct regulator_ops tps68470_regulator_ops = { |
86 | .is_enabled = regulator_is_enabled_regmap, |
87 | .enable = tps68470_regulator_enable, |
88 | .disable = tps68470_regulator_disable, |
89 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
90 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
91 | .list_voltage = regulator_list_voltage_linear_range, |
92 | .map_voltage = regulator_map_voltage_linear_range, |
93 | }; |
94 | |
95 | static const struct regulator_ops tps68470_always_on_reg_ops = { |
96 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
97 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
98 | .list_voltage = regulator_list_voltage_linear_range, |
99 | .map_voltage = regulator_map_voltage_linear_range, |
100 | }; |
101 | |
102 | static const struct regulator_desc regulators[] = { |
103 | TPS68470_REGULATOR(CORE, TPS68470_CORE, tps68470_regulator_ops, 43, |
104 | TPS68470_REG_VDVAL, TPS68470_VDVAL_DVOLT_MASK, |
105 | TPS68470_REG_VDCTL, TPS68470_VDCTL_EN_MASK, |
106 | tps68470_core_ranges, ARRAY_SIZE(tps68470_core_ranges)), |
107 | TPS68470_REGULATOR(ANA, TPS68470_ANA, tps68470_regulator_ops, 126, |
108 | TPS68470_REG_VAVAL, TPS68470_VAVAL_AVOLT_MASK, |
109 | TPS68470_REG_VACTL, TPS68470_VACTL_EN_MASK, |
110 | tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), |
111 | TPS68470_REGULATOR(VCM, TPS68470_VCM, tps68470_regulator_ops, 126, |
112 | TPS68470_REG_VCMVAL, TPS68470_VCMVAL_VCVOLT_MASK, |
113 | TPS68470_REG_VCMCTL, TPS68470_VCMCTL_EN_MASK, |
114 | tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), |
115 | TPS68470_REGULATOR(VIO, TPS68470_VIO, tps68470_always_on_reg_ops, 126, |
116 | TPS68470_REG_VIOVAL, TPS68470_VIOVAL_IOVOLT_MASK, |
117 | 0, 0, |
118 | tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), |
119 | /* |
120 | * (1) This regulator must have the same voltage as VIO if S_IO LDO is used to |
121 | * power a sensor/VCM which I2C is daisy chained behind the PMIC. |
122 | * (2) If there is no I2C daisy chain it can be set freely. |
123 | */ |
124 | TPS68470_REGULATOR(VSIO, TPS68470_VSIO, tps68470_regulator_ops, 126, |
125 | TPS68470_REG_VSIOVAL, TPS68470_VSIOVAL_IOVOLT_MASK, |
126 | TPS68470_REG_S_I2C_CTL, TPS68470_S_I2C_CTL_EN_MASK, |
127 | tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), |
128 | TPS68470_REGULATOR(AUX1, TPS68470_AUX1, tps68470_regulator_ops, 126, |
129 | TPS68470_REG_VAUX1VAL, TPS68470_VAUX1VAL_AUX1VOLT_MASK, |
130 | TPS68470_REG_VAUX1CTL, TPS68470_VAUX1CTL_EN_MASK, |
131 | tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), |
132 | TPS68470_REGULATOR(AUX2, TPS68470_AUX2, tps68470_regulator_ops, 126, |
133 | TPS68470_REG_VAUX2VAL, TPS68470_VAUX2VAL_AUX2VOLT_MASK, |
134 | TPS68470_REG_VAUX2CTL, TPS68470_VAUX2CTL_EN_MASK, |
135 | tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)), |
136 | }; |
137 | |
138 | static int tps68470_regulator_probe(struct platform_device *pdev) |
139 | { |
140 | struct device *dev = &pdev->dev; |
141 | struct tps68470_regulator_platform_data *pdata = dev_get_platdata(dev); |
142 | struct tps68470_regulator_data *data; |
143 | struct regulator_config config = { }; |
144 | struct regulator_dev *rdev; |
145 | int i; |
146 | |
147 | data = devm_kzalloc(dev, size: sizeof(*data), GFP_KERNEL); |
148 | if (!data) |
149 | return -ENOMEM; |
150 | |
151 | data->clk = devm_clk_get(dev, id: "tps68470-clk" ); |
152 | if (IS_ERR(ptr: data->clk)) |
153 | return dev_err_probe(dev, err: PTR_ERR(ptr: data->clk), fmt: "getting tps68470-clk\n" ); |
154 | |
155 | config.dev = dev->parent; |
156 | config.regmap = dev_get_drvdata(dev: dev->parent); |
157 | config.driver_data = data; |
158 | |
159 | for (i = 0; i < TPS68470_NUM_REGULATORS; i++) { |
160 | if (pdata) |
161 | config.init_data = pdata->reg_init_data[i]; |
162 | else |
163 | config.init_data = NULL; |
164 | |
165 | rdev = devm_regulator_register(dev, regulator_desc: ®ulators[i], config: &config); |
166 | if (IS_ERR(ptr: rdev)) |
167 | return dev_err_probe(dev, err: PTR_ERR(ptr: rdev), |
168 | fmt: "registering %s regulator\n" , |
169 | regulators[i].name); |
170 | } |
171 | |
172 | return 0; |
173 | } |
174 | |
175 | static struct platform_driver tps68470_regulator_driver = { |
176 | .driver = { |
177 | .name = "tps68470-regulator" , |
178 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
179 | }, |
180 | .probe = tps68470_regulator_probe, |
181 | }; |
182 | |
183 | /* |
184 | * The ACPI tps68470 probe-ordering depends on the clk/gpio/regulator drivers |
185 | * registering before the drivers for the camera-sensors which use them bind. |
186 | * subsys_initcall() ensures this when the drivers are builtin. |
187 | */ |
188 | static int __init tps68470_regulator_init(void) |
189 | { |
190 | return platform_driver_register(&tps68470_regulator_driver); |
191 | } |
192 | subsys_initcall(tps68470_regulator_init); |
193 | |
194 | static void __exit tps68470_regulator_exit(void) |
195 | { |
196 | platform_driver_unregister(&tps68470_regulator_driver); |
197 | } |
198 | module_exit(tps68470_regulator_exit); |
199 | |
200 | MODULE_ALIAS("platform:tps68470-regulator" ); |
201 | MODULE_DESCRIPTION("TPS68470 voltage regulator driver" ); |
202 | MODULE_LICENSE("GPL v2" ); |
203 | |